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Share-based Payments - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 CAD ($) shares | Dec. 31, 2017 CAD ($) shares | Dec. 31, 2016 CAD ($)
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number Of Share Options Granted In Sharebased Payment Arrangement | shares | 1,910,000 | 6,402,000 |
Weighted Average Share Price | $ 9.37 | $ 3.66 |
Vesting description | These options shall expire at the earlier of 180 days of the death, disability or incapacity of the holder or specified expiry date, and can only be settled in common shares. |  |
Weighted average exercise price of options outstanding | $ 2.99 | 2.05 | $ 1.10
Weighted average exercise price of options exercisable | $ 2.28 | $ 1.71 |
2015 Stock option plan |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number Of Share Options Granted In Sharebased Payment Arrangement | shares | 0 |  |
Death, disability and Incapacity of Holder [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Options expire period | 180 days |  |

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- Definition The description of the vesting requirements for a type of share-based payment arrangement that existed at any time during the period. An entity with substantially similar types of share-based payment arrangements may aggregate this information. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_a&doctype=Standard -URIDate 2017-03-09 + Details
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